7. Torts Relating to Movable Property

This is the 7th post in Law of Torts, Unit 3 — Specific Torts and Torts Affecting Property (the previous post covered nuisance, public and private, the tort of indirect interference with land). This post covers the torts that protect movable property — goods and chattels — namely trespass to goods, conversion, and detinue.

The Problem This Topic Solves

Just as land needs protection from direct entry and indirect interference, movable property — goods, chattels, and personal belongings — needs its own set of protections, because interference with goods can take very different forms: a brief, harmless touching; a serious act of dealing with someone's goods as though they were one's own; or simply refusing to hand goods back when properly asked. The law addresses these situations through three related but distinct torts — trespass to goods, conversion, and detinue — each with its own essentials and its own remedy. Understanding which of the three applies to a given set of facts, and who has standing to sue even where the plaintiff is not the true owner, is essential to correctly resolving disputes over movable property.

Trespass to Goods

Trespass to goods is a direct and either intentional or negligent interference with goods in the possession of another, committed without lawful justification. It may take the form of physically taking the goods, moving them, damaging them, or even merely touching them without permission, since the tort protects the plaintiff's possession itself and not merely the goods' physical condition. Trespass to goods is actionable per se in most circumstances — the plaintiff need not prove actual damage, though in practice the extent of harm affects the amount of damages awarded. The tort protects the person in possession of the goods at the time of the interference, so a bailee (a person who has lawful possession of goods belonging to another, such as someone who has borrowed or been entrusted with an item) can sue a stranger who interferes with the goods, even though the bailee is not the owner.

Conversion (Trover)

Conversion, historically also called trover, is committed when a person deals with goods in a manner that is seriously inconsistent with the rights of the person entitled to them, amounting to a denial of that person's title or right to the goods. Unlike trespass to goods, which can be a comparatively minor interference, conversion requires a serious act that effectively treats the goods as though they belonged to the defendant, or deprives the rightful possessor of them altogether. Conversion can be committed in several ways: by wrongfully taking goods out of another's possession; by wrongfully detaining goods after a demand for their return; by wrongfully selling or disposing of goods belonging to another, even innocently, such as an auctioneer who sells stolen goods without knowledge of the theft; or by wrongfully destroying goods or altering them so fundamentally that their identity is lost. Because conversion is concerned with a serious denial of title, the usual measure of damages is the full value of the goods at the time of conversion, effectively compelling the defendant to "buy" the goods they have wrongfully dealt with.

Detinue

Detinue is the wrongful detention of another's goods after a proper demand has been made for their return. Unlike conversion, where the plaintiff's remedy is typically confined to damages representing the value of the goods, the distinguishing feature of detinue is that the plaintiff can specifically seek the return of the actual goods themselves, and not merely their monetary value — this matters where the goods have some special or unique value to the plaintiff that money cannot adequately replace, such as an heirloom or a document. The essentials of detinue are: the defendant must be in possession of the plaintiff's goods, the plaintiff must make a proper demand for their return, and the defendant must wrongfully refuse or fail to return them within a reasonable time. If the defendant is unable to return the goods because they have since been lost or destroyed, the remedy converts into an award of damages equal to their value.

Who May Sue — Possession as the Protected Interest

A recurring theme across all three torts is that possession, not ownership, is generally sufficient to sue. A person in actual possession of goods, even if not the true owner, can maintain an action against a third party who interferes with, converts, or wrongfully detains those goods, because possession itself is a legally protected interest. This is precisely the principle established in Armory v. Delamirie — the finder of the jewel was never its true owner, yet the court recognised that he held a title good against the whole world except the true owner, and could sue the goldsmith's apprentice who wrongfully deprived him of it. The only person who cannot successfully be sued by the possessor in such circumstances is the true owner asserting their own superior title, since the possessor's title, though good against everyone else, always yields to the actual owner's claim.

Measure of Damages

For trespass to goods, damages are generally assessed based on the actual harm caused — the cost of repair, or the diminution in value, since the tort does not necessarily involve total deprivation of the goods. For conversion, the ordinary measure is the full market value of the goods at the time and place of conversion, reflecting the fact that the defendant has effectively deprived the plaintiff of the goods entirely. For detinue, the primary remedy is the return of the specific goods themselves (or, where that is no longer possible, their value), together with damages for any loss suffered because of the wrongful detention, such as loss of use during the period the goods were wrongfully withheld.

A Practical Example

A lends B a valuable camera for a week. Instead of returning it, B sells the camera to C, an innocent buyer unaware that B was not the owner. A demands the camera back from C, but C refuses. C is liable to A for conversion, since dealing with the camera as though it were their own, and refusing to return it to the true owner on demand, amounts to a serious denial of A's title, even though C acted innocently in purchasing it. If, instead, C still possessed the camera and A specifically wanted the camera itself back rather than its money value (say, because it held sentimental photographs), A could frame the claim as one in detinue, seeking an order for the actual return of the camera, in addition to or instead of damages.

Quick Revision Points

• Trespass to goods, conversion, and detinue are the three torts protecting movable property, each addressing a different degree and kind of interference.
• Trespass to goods: direct interference with possession, actionable per se, damages reflect actual harm.
• Conversion: a serious act denying the plaintiff's title — wrongful taking, detention, sale, or destruction — damages equal the full value of the goods.
• Detinue: wrongful detention after a proper demand, with the distinctive remedy of an order for return of the specific goods themselves.
• Armory v. Delamirie (1722) — a finder's title is good against everyone except the true owner; damages assessed against the party who refuses to produce the goods on the highest reasonable presumption of value.
• Possession, not ownership, generally suffices to sue in all three torts.
• Innocent dealing (e.g. an innocent auctioneer or buyer) does not excuse liability for conversion — the tort does not require dishonest intent.
• If detinue goods are lost or destroyed before return, the remedy converts into damages equal to their value.