"Sin In Justice" is a collaborative single by Vamps with a Finnish cello metal band from Helsinki, Finland, Apocalyptica released on November 20, 2015 as a digital single. This single is Vamps's eleventh single also the first single from album Underworld.

Whilst touring together in the US in earlier of 2015, Apocalyptica and VAMPS discussed the idea of doing more work together, as a result of which – in addition to the six UK shows later that month – the musicians have joined forces for a fresh piece of music: ‘SIN IN JUSTICE’, backed up by a lyric video put together by Craig Gowans, who has recently worked with both Killing Joke and Atreyu.

For VAMPS, this is the first time they’ve collaborated with classically trained players, and it’s an experience they found inspiring

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