Lassie is an efficient open-source retrieval client designed for the Filecoin network, offering seamless data fetching over the most optimized retrieval protocols. It supports multiple methods of data retrieval, including a user-friendly command-line interface for ad-hoc and test purposes, an HTTP API for web-server-based content access, and a Golang library for programmatic integration into custom applications. Lassie leverages content-addressed archive (CAR) format to streamline the retrieval process, with additional support for extracting content to local files utilizing the go-car package. Integration is straightforward via manual binary installation or utilizing Go package manager commands. The project is actively seeking contributions, further enhancing its capabilities, and is available under dual Apache 2.0 and MIT licenses.